الكثير من اللقاحات التي تم تطويرها للتصدي لفيروس كورونا أثبتت قدرتها على توفير حماية طويلة الأمد من الإصابة بالعدوى ولكن مطوري اللقاحات بدأوا في صنع واختبار نسخ من لقاحاتهم تحمي من السلالات والطفرات الجديدة والمتغيرات المقلقة للفيروس
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